Insights

Notes from the work

What we have learned delivering enterprise software, data, cloud and AI. Written by the people doing the delivery.

A row of early personal computers on a desk

Latest · Banking

What a core banking migration actually costs

The licence and the integrator are the visible costs. The ones that overrun are reconciliation, dual running, and the year of parallel support nobody scheduled.

19 August 2026 · 9 min read

More writing

8 posts · all by Lumy Labs

A cockpit control panel photographed close up

Cloud

Zero downtime is a property of your rollback

Teams rehearse the deploy and improvise the rollback. That is backwards: the deploy is the step you can retry, and the rollback is the one you cannot.

29 July 2026 · 7 min read

A wall of clocks, each showing a different time

Data

Why your data warehouse keeps drifting from reality

The dashboard was right when it was built. Nothing broke. It is wrong now because the business changed underneath a definition nobody owns.

8 July 2026 · 8 min read

The drawers of a wooden library card catalogue

Grounding is the part users actually judge

A model that is right most of the time and cannot show its work is unusable in a regulated setting. Retrieval quality and citation are the product, not the model.

17 June 2026 · 9 min read

Hand tools arranged in a rack on a workshop wall

Platform

The only platform metric that matters

Adoption dashboards measure whether people were told to use the platform. Time to a running service in production measures whether it helps.

27 May 2026 · 7 min read

A patient monitor displaying vital signs

Healthcare

FHIR without a rewrite

Interoperability programmes stall when they are framed as replacing the clinical system. Framed as a façade over it, they ship in months.

6 May 2026 · 8 min read

Tactile paving with raised dots on a pavement

Public sector

Accessibility when the audit is a legal deadline

A remediation sprint before an audit buys a passing report and nothing else. The teams that stay compliant changed where accessibility is decided.

15 April 2026 · 7 min read

A control room filled with monitoring equipment

DevOps

Observability that survives being woken up

Dashboards are built by people who already understand the system, for people who already understand the system. At 3am neither is true.

25 March 2026 · 8 min read

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